US7083391B2 - Method and device for detecting the speed of a pump - Google Patents
Method and device for detecting the speed of a pump Download PDFInfo
- Publication number
- US7083391B2 US7083391B2 US10/662,827 US66282703A US7083391B2 US 7083391 B2 US7083391 B2 US 7083391B2 US 66282703 A US66282703 A US 66282703A US 7083391 B2 US7083391 B2 US 7083391B2
- Authority
- US
- United States
- Prior art keywords
- pump
- pressure
- pressure signal
- signal
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/08—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/404—Control of the pump unit
- B60T8/4059—Control of the pump unit involving the rate of delivery
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/26—Devices characterised by the use of fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/26—Devices characterised by the use of fluids
- G01P3/28—Devices characterised by the use of fluids by using pumps
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/489—Digital circuits therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/12—Parameters of driving or driven means
- F04B2201/1201—Rotational speed of the axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0209—Rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/05—Pressure after the pump outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/18—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/80—Diagnostics
Definitions
- the present invention relates to a method and a system for detecting the speed of a pump motor.
- German Patent 41 33 269 describes a method for measuring the speed of a rotating part surrounded by a housing, in which a further signal that is a function of the speed is detected, and this further signal is filtered and digitalized, as well as Fourier-transformed twice. The speed is ascertained from the spectrum thus obtained, by evaluating the absolute maximum. A relatively great computing power is necessary to implement such a speed measurement because of the Fourier analysis used.
- the present invention provide a method and a system for detecting the speed of a pump motor as simply and inexpensively as possible, by determining the pressure peaks within the pressure signal representing the delivery activity of the pump.
- the start-up of a pump motor may be reliably monitored, for example.
- the detection method according to the present invention universally applicable, i.e., independent of the type and the driving of the pump motor.
- the detection method according to the present invention requires no correction to compensate for the temperature factor, and the method is substantially robust with respect to disturbing reflections between a pump and a reservoir acted upon by the pump.
- a pressure signal that has been filtered of high-frequency and/or low-frequency interferences may be further processed in a simple manner.
- the pressure signal may be shaped by means of a comparator circuit to obtain a square-wave signal whose frequency is proportional to the speed of the pump motor.
- a square-wave signal thus obtained may be readily evaluated by calculation.
- suitable filtering means e.g., a low-pass filter or a high-pass filter, may be used.
- Such filters may be made available inexpensively.
- FIG. 1 shows a time graph illustrating the pressure characteristic in a pressure system acted upon by a pressure pump.
- FIG. 2 shows a graph illustrating the spectral view of the pressure signal shown in FIG. 1 .
- FIG. 3 shows a block diagram illustrating the filtering of the pressure signal shown in FIG. 1 , in accordance with the present invention.
- FIG. 4 shows a filtered time signal in accordance with the present invention, which signal is obtained after the filtering in accordance with FIG. 3 .
- FIG. 5 shows a square-wave signal obtained after the signal shown in FIG. 4 has been further processed by a comparator.
- FIG. 6 shows a schematic block diagram of an example embodiment of the device according to the present invention.
- a pump In a hydraulic pump system, a pump is driven by a pump motor to deliver a hydraulic fluid, via a pressure-media line, into a high-pressure reservoir. During this delivery, pressure peaks develop within the framework of a pressure signal in the pressure-media line and/or in the high-pressure reservoir, the time interval between the pressure peaks being a measure of the speed of the pump motor.
- the pressure signal is detected by a suitable sensor and converted into a corresponding current signal or voltage signal.
- a signal of this type after an optional digitalization, is further processed in a computing device.
- FIG. 6 A schematic representation of a hydraulic pump system in accordance with the present invention is shown in FIG. 6 .
- 60 designates a pump motor which drives a pump 62 .
- Pump 62 in turn delivers hydraulic fluid via a hydraulic line 64 into a high-pressure reservoir 66 .
- the pressure created in this high-pressure reservoir is detected by a pressure sensor 68 to obtain a pressure signal representing the pump activity, and the pressure signal is optionally converted into a corresponding electrical signal and digitalized.
- a signal of this type is supplied to a computing device 70 , in which the further evaluation of the signal may be carried out.
- the pressure signal p determined in the high-pressure reservoir 66 e.g., the voltage signal representing the pressure in the reservoir
- the pressure signal p determined in the high-pressure reservoir 66 is superimposed with high-frequency interferences due to reflections between the pump output and the high-pressure reservoir.
- a DC voltage component stemming from the rising pressure in the reservoir 66 because of the action of the pump on the reservoir.
- FIG. 2 which shows a spectral view of the signal shown in FIG. 1
- the pressure signal p is plotted against frequency f.
- the DC-voltage component of the pressure signal is designated here by 1
- the high-frequency interference component of the signal is designated by 2 .
- the useful component of the signal i.e., the component of the pressure signal actually used in the method according to the present invention, is provided with reference numeral 3 .
- pressure signal p is first supplied to a low-pass filter 10 having a suitable cut-off frequency, which suppresses interfering high-frequency component 2 of the pressure signal. Subsequently, in a second step, the signal is conducted through a high-pass filter 12 having a suitable cut-off frequency, which filter suppresses the DC voltage component 1 .
- Signal p′ emerging from the high-pass filter represents a filtered time signal whose time characteristic is shown in FIG. 4 .
- the curves of filters 10 , 12 are represented by dotted lines in FIG. 2 .
- Signal p′ is supplied to a comparator circuit 13 , which outputs a square-wave signal p′′ whose frequency is proportional to the speed of pump motor 60 .
- a square-wave signal p′′ of this type is shown in FIG. 5 , plotted against time. The period length of the signal is designated by T, and the respective period beginnings are designated by t 0 , t 1 , t 2 , etc.
- the actual speed of pump motor 60 may be inferred directly by suitable normalization.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10244203A DE10244203A1 (en) | 2002-09-23 | 2002-09-23 | Hydraulic pump angular velocity determination method in which a transport pressure of the pump is measured and the frequency of pressure peaks within the pressure signal related to pump angular velocity |
DE10244203.7 | 2002-09-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20040126243A1 US20040126243A1 (en) | 2004-07-01 |
US7083391B2 true US7083391B2 (en) | 2006-08-01 |
Family
ID=31969435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/662,827 Expired - Fee Related US7083391B2 (en) | 2002-09-23 | 2003-09-15 | Method and device for detecting the speed of a pump |
Country Status (3)
Country | Link |
---|---|
US (1) | US7083391B2 (en) |
JP (1) | JP2004117348A (en) |
DE (1) | DE10244203A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110270525A1 (en) * | 2010-04-30 | 2011-11-03 | Scott Hunter | Machines, systems, computer-implemented methods, and computer program products to test and certify oil and gas equipment |
US20120161442A1 (en) * | 2008-09-17 | 2012-06-28 | Chapdrive As | Turbine speed stabilisation control system |
US20120298375A1 (en) * | 2011-05-24 | 2012-11-29 | Schneider Electric USA, Inc. | Pumpjack Production Control |
USD750516S1 (en) | 2014-09-26 | 2016-03-01 | S.P.M. Flow Control, Inc. | Electronic device holder |
US9417160B2 (en) | 2012-05-25 | 2016-08-16 | S.P.M. Flow Control, Inc. | Apparatus and methods for evaluating systems associated with wellheads |
US20160349775A1 (en) * | 2014-02-13 | 2016-12-01 | Robert Bosch Gmbh | Current detection device and method for sensing an electrical current |
US20160349289A1 (en) * | 2014-02-13 | 2016-12-01 | Robert Bosch Gmbh | Circuit arrangement and method for current measurement |
USD774495S1 (en) | 2012-05-09 | 2016-12-20 | S.P.M. Flow Control, Inc. | Electronic device holder |
US9940492B2 (en) | 2014-07-30 | 2018-04-10 | S.P.M. Flow Control, Inc. | Band with RFID chip holder and identifying component |
US10102471B2 (en) | 2015-08-14 | 2018-10-16 | S.P.M. Flow Control, Inc. | Carrier and band assembly for identifying and managing a component of a system associated with a wellhead |
US11037039B2 (en) | 2015-05-21 | 2021-06-15 | S.P.M. Flow Control, Inc. | Method and system for securing a tracking device to a component |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7387498B2 (en) * | 2003-12-04 | 2008-06-17 | York International Corporation | System and method for noise attenuation of screw compressors |
JP4214965B2 (en) * | 2004-07-22 | 2009-01-28 | 株式会社デンソー | Evaporative fuel treatment device leak detection device |
JP2006046292A (en) * | 2004-08-09 | 2006-02-16 | Hitachi Constr Mach Co Ltd | Method for correcting tilt control signal, tilt control device, construction machine, and tilt control signal correcting program |
DE102005059564A1 (en) | 2005-12-13 | 2007-06-14 | Brueninghaus Hydromatik Gmbh | Device and method for condition monitoring in hydrostatic displacement units |
US7798781B2 (en) * | 2006-02-22 | 2010-09-21 | Hamilton Sundstrand Corporation | Metering pump with self-calibration and health prediction |
DE102007034113B4 (en) * | 2007-07-21 | 2018-07-19 | Continental Teves Ag & Co. Ohg | Method for calibrating a hydraulic pump |
DE102008035954A1 (en) * | 2008-07-31 | 2010-02-04 | Beckhoff Automation Gmbh | Method and device for monitoring a displacement machine |
CN103823078A (en) * | 2014-02-26 | 2014-05-28 | 武汉大学 | Method for testing rotary speed of water pump |
DE102014216230A1 (en) * | 2014-08-14 | 2016-02-18 | Continental Teves Ag & Co. Ohg | Method for determining a position and / or positional change of a hydraulic pump of a motor vehicle brake system and motor vehicle brake system |
CN107725347A (en) * | 2017-11-01 | 2018-02-23 | 福建侨龙应急装备有限公司 | A kind of hydraulic pump speed detector, method and drainage car |
DE102019110569A1 (en) * | 2019-04-24 | 2020-10-29 | Man Truck & Bus Se | Method and device for determining the speed of a pump |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4492524A (en) * | 1980-09-23 | 1985-01-08 | Bruker-Analytische Messtechnik Gmbh | Multiple piston pump with a constant discharge capacity |
US4679488A (en) * | 1985-12-04 | 1987-07-14 | Gary Krutz | Integral rotational displacement sensor for an hydraulic motor |
US4965713A (en) * | 1988-08-15 | 1990-10-23 | Viking Pump Inc. | Terminal element |
DE4133269A1 (en) | 1991-10-08 | 1993-04-15 | Bosch Gmbh Robert | METHOD FOR MEASURING THE SPEED OF A ROTATING PART |
US5664937A (en) * | 1994-02-03 | 1997-09-09 | Hitachi, Ltd. | Precisely flow-controlling pump |
US5678521A (en) * | 1993-05-06 | 1997-10-21 | Cummins Engine Company, Inc. | System and methods for electronic control of an accumulator fuel system |
US6276134B1 (en) * | 1997-12-12 | 2001-08-21 | Komatsu Ltd. | Apparatus for controlling a plurality of hydraulic motors and a clutch |
-
2002
- 2002-09-23 DE DE10244203A patent/DE10244203A1/en not_active Ceased
-
2003
- 2003-09-05 JP JP2003313973A patent/JP2004117348A/en not_active Withdrawn
- 2003-09-15 US US10/662,827 patent/US7083391B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4492524A (en) * | 1980-09-23 | 1985-01-08 | Bruker-Analytische Messtechnik Gmbh | Multiple piston pump with a constant discharge capacity |
US4679488A (en) * | 1985-12-04 | 1987-07-14 | Gary Krutz | Integral rotational displacement sensor for an hydraulic motor |
US4965713A (en) * | 1988-08-15 | 1990-10-23 | Viking Pump Inc. | Terminal element |
DE4133269A1 (en) | 1991-10-08 | 1993-04-15 | Bosch Gmbh Robert | METHOD FOR MEASURING THE SPEED OF A ROTATING PART |
US5678521A (en) * | 1993-05-06 | 1997-10-21 | Cummins Engine Company, Inc. | System and methods for electronic control of an accumulator fuel system |
US5664937A (en) * | 1994-02-03 | 1997-09-09 | Hitachi, Ltd. | Precisely flow-controlling pump |
US6276134B1 (en) * | 1997-12-12 | 2001-08-21 | Komatsu Ltd. | Apparatus for controlling a plurality of hydraulic motors and a clutch |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120161442A1 (en) * | 2008-09-17 | 2012-06-28 | Chapdrive As | Turbine speed stabilisation control system |
US20110270525A1 (en) * | 2010-04-30 | 2011-11-03 | Scott Hunter | Machines, systems, computer-implemented methods, and computer program products to test and certify oil and gas equipment |
US10196878B2 (en) | 2010-04-30 | 2019-02-05 | S.P.M. Flow Control, Inc. | Machines, systems, computer-implemented methods, and computer program products to test and certify oil and gas equipment |
US9915128B2 (en) | 2010-04-30 | 2018-03-13 | S.P.M. Flow Control, Inc. | Machines, systems, computer-implemented methods, and computer program products to test and certify oil and gas equipment |
US20120298375A1 (en) * | 2011-05-24 | 2012-11-29 | Schneider Electric USA, Inc. | Pumpjack Production Control |
US8910710B2 (en) * | 2011-05-24 | 2014-12-16 | Schneider Electric USA, Inc. | Pumpjack production control |
USD774495S1 (en) | 2012-05-09 | 2016-12-20 | S.P.M. Flow Control, Inc. | Electronic device holder |
US10760402B2 (en) | 2012-05-25 | 2020-09-01 | S.P.M. Flow Control, Inc. | Apparatus and methods for evaluating systems associated with wellheads |
US9417160B2 (en) | 2012-05-25 | 2016-08-16 | S.P.M. Flow Control, Inc. | Apparatus and methods for evaluating systems associated with wellheads |
US10018031B2 (en) | 2012-05-25 | 2018-07-10 | S.P.M. Flow Control, Inc. | Apparatus and methods for evaluating systems associated with wellheads |
US10018655B2 (en) * | 2014-02-13 | 2018-07-10 | Robert Bosch Gmbh | Circuit arrangement and method for current measurement |
US10013008B2 (en) * | 2014-02-13 | 2018-07-03 | Robert Bosch Gmbh | Current detection device and method for sensing an electrical current |
US20160349289A1 (en) * | 2014-02-13 | 2016-12-01 | Robert Bosch Gmbh | Circuit arrangement and method for current measurement |
US20160349775A1 (en) * | 2014-02-13 | 2016-12-01 | Robert Bosch Gmbh | Current detection device and method for sensing an electrical current |
US9940492B2 (en) | 2014-07-30 | 2018-04-10 | S.P.M. Flow Control, Inc. | Band with RFID chip holder and identifying component |
US10339347B2 (en) | 2014-07-30 | 2019-07-02 | S.P.M. Flow Control, Inc. | Band with RFID chip holder and identifying components |
USD750516S1 (en) | 2014-09-26 | 2016-03-01 | S.P.M. Flow Control, Inc. | Electronic device holder |
US11037039B2 (en) | 2015-05-21 | 2021-06-15 | S.P.M. Flow Control, Inc. | Method and system for securing a tracking device to a component |
US10102471B2 (en) | 2015-08-14 | 2018-10-16 | S.P.M. Flow Control, Inc. | Carrier and band assembly for identifying and managing a component of a system associated with a wellhead |
Also Published As
Publication number | Publication date |
---|---|
DE10244203A1 (en) | 2004-04-01 |
JP2004117348A (en) | 2004-04-15 |
US20040126243A1 (en) | 2004-07-01 |
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